Bread.
By far the most common product of homebrewer's spent grains (don't fact-check me ;)).
With just 3 cups of (wet) grains, you can make a couple loaves of excellent bread.
Our recent recipe:
- 3 cups of wet grains
- (in this case they were 2 parts Crystal 120 and 1 part Special B)
- 3-4 cups of flour (depending on grain's water content)
- "a bit" of oil
- 1 cup warm water
- 1/3 cup of sugar
- a package of dry bakers yeast
Start yeast in warm water. Mix/kneed flour into grains. Enough flour so that the dough isn't sticky. Let the dough rise until it's doubled in size. Split into two. Bake at 375º for 30-40 min.
It turned out real tasty: sweet, dense but fluffy (if that's possible).
Your mileage may vary, as this was at high altitude (5,280 feet or so).